| 基于大气参数拟合的GF-1多光谱影像大气校正 |
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| 引用本文： | 薛现光,周杨,胡校飞,许继伟.基于大气参数拟合的GF-1多光谱影像大气校正[J].海洋测绘,2018(5):50-54. |
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| 作者姓名： | 薛现光 周杨 胡校飞 许继伟 |
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| 作者单位： | 解放军信息工程大学 地理空间信息学院,河南 郑州 450001 |
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| 基金项目： | 国家863计划(2014AA7033049) |
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| 摘 要： | 针对大气校正常使用的基于查找表的方法建表速度缓慢、查找精度低等问题,提出在6S大气校正模型的基础上,以气溶胶厚度为自变量对大气参数进行拟合的算法,使用该算法对GF-1多光谱影像进行大气校正研究。对半球反射率、路径辐射项等效反射率、大气透过率3个大气参数使用三次多项式进行拟合,拟合后的决定系数都达到了0. 999 8;根据拟合结果使用MODIS气溶胶产品作为输入,逐像元计算大气参数,并对影像进行大气校正,将校正结果与FLAASH模型校正结果进行对比。结果表明,该算法能有效校正大气对GF-1多光谱影像的影响,并与FLAASH校正结果具有很好的一致性。
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| 关 键 词： | 大气校正 大气参数 6S模型 GF-1 MODIS气溶胶产品 影像预处理 |
Atmospheric Correction of GF-1 Multi-spectral Images Based on Fitting of Atmospheric Parameters |
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| XUE Xianguang,ZHOU Yang,HU Xiaofei,XU Jiwei.Atmospheric Correction of GF-1 Multi-spectral Images Based on Fitting of Atmospheric Parameters[J].Hydrographic Surveying and Charting,2018(5):50-54. |
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| Authors: | XUE Xianguang ZHOU Yang HU Xiaofei XU Jiwei |
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| Affiliation: | School of Surveying and Mapping,Information Engineering University,Zhengzhou 450001 ,China |
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| Abstract: | Aiming at solving the problems of low efficiency and low accuracy existed in look-up table method of applying for atmosphere correction,a new method,which uses the aerosol thickness to fit the atmospheric parameters under 6S atmospheric correction model,is put forward and used in the atmosphere correction of GF-1 multiple images.Taking Zhengzhou city as the experiment area,the hemisphere reflectivity,path radiance equivalent reflectivity and atmospheric transmittance are fitted by one variable cubic equation,and the coefficient of determination after fitting is up to 0.9998.Combining with the fitting results,the image is corrected by using MODIS aerosol product as input parameters to calculate atmospheric parameters pixel by pixel.Compared with the FLAASH model atmospheric correction,our method can effectively conduct atmosphere correction on GF-1 multiple image,and the results are consistent with FLAASH model atmospheric correction results. |
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